Summer in the City: the UK's biggest YouTube gathering â video

Summer in the City is the largest UK event dedicated to YouTube content creators and users. YouTube video creators with millions of subscribers â including Tyler Oakley, Zoella, Sorted Food and Vsauce â explain why they're attending the event at Alexandra Palace, north London, as well as other huge conventions such as VidCon in the US and VideoDays in Germany. Is YouTube about to replace TV, or is it just an online community for people with niche interests?